Fig. 6
Upper panel: APEX spectra of the SiO(5−4) and (8–7) lines in the OF1 region around IRAS 17233-3606 observed at 
, δ[J2000] = − 36°09′20″. Lower panel: SiO(8–7)/SiO(5−4) line ratio as function of velocity (black line). The red line is the SiO(8–7) spectrum. The dashed lines mark the velocity ranges used in Sect. 4, blue [− 30, − 20], and red [+ 10, + 39] km s-1.
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